Abstract
Electronic absorption spectra of the components of the membranes of anion‐selective electrodes containing Co(OH)‐ and Sn(OH) Sn(OH)2 tetraphenyl porphyrins (TPP) as electroactive substances and various softeners and lipophilic ionic additives have been investigated. 2‐Nitrophenyloctylic ether, α‐bromonaphthalene, dibutyl phthalate, and dioctyl phthalate were used as softeners; tetradecyl ammonium nitrate and tetrakis(4‐chlorophenyl)potassium borate were used as ionic additives. To investigate the electronic absorption spectra, we dissolved the membranes in cyclohexane at different pH before and after their use. The influence of the acidity and the nature of a softener on the position and intensity of the absorption bands of metalloporphyrin in a membrane is discussed. It is shown that the use of membranes containing Co(OH)TPP in highly acidic media is accompanied by its demetallation and the formation of protonized forms of TPP. The membranes based on Sn(OH)2TPP are more stable in acid media.
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Avlasevich, Y.S., Rat'ko, A.A. & Egorov, V.V. Change in the Absorption Spectra of Membranes Containing Co(III)‐ and Sn(IV) Tetraphenyl Porphyrins as a Result of the Use of Anion‐Selective Electrodes Based on Them. Journal of Applied Spectroscopy 69, 554–559 (2002). https://doi.org/10.1023/A:1020652031638
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DOI: https://doi.org/10.1023/A:1020652031638